*{
    font-size: 15px;
  }
  .list-group-item{
    font-size: 18px;
    font-weight:bold;
  }
  #list{
    margin-top: 15px;
  }
  .profile{
    margin-top: 15px;
  }
  h3{
    margin-top: 0;
  }
  .jumbotron{
    height: 420px;
    background-image: url("img/jumu.jpg");
    background-size:100% 100%;
    }
  .list-group #jianjie{
    display:block;
    line-height:1.5em;
    }
  .profile{
    line-height:2em;
    letter-spacing:2px;  
    font-size: 15px;
    text-indent:2em;
  }